I will start by saying that you shouldn´t expect too much from this drama if you want a exciting and complex story, because this is not what king the land is going to offer.
Personally I really enjoyed watching it though. It was really relaxing, refreshing and wholesome. Even though there isn´t much depth to the storyline and some characters background, it still felt well done.
The chemistry between the main couple was just wonderful to see and I never got bored watching episode after episode seeing them being absolutely smitten by eachother! There isn´t much drama or unnecessary breakups included and the relationship of guwon and sarang seemed very mature and straightforward.
For some people this drama might be a bit too simple and boring, but if you just want to watch episodes full of fluff and not a lot of dramatic aspects, it might be perfect for you!